JP2006103661A - Load supporting device for heavily-equipped cab, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load supporting device for a heavily equipped-cab simply and easily fastenable without disassembling a car body frame even if the car body frame has closed structure and capable of eliminating a possibility of breakage of a fastening part an external impact. <P>SOLUTION: This load supporting device for a heavily equipped-cab is provided with a fastening boss in a lower surface of the car body frame in advance, and structured so that the load supporting device to be screw-connected to the fastening boss is fastened from a bottom frame side of the operation chamber to a bottom plate side thereof. The load supporting device for a heavily equipped-cab is formed of the car body frame installed in a lower travelling body, the operation chamber loaded on the car body frame, a vibration absorbing device for elastically supporting the operation chamber provided between the car body frame and the bottom frame, and the load supporting device possible fastened from the bottom frame side of the operation chamber to the car body frame side after assembling the car body frame and the cab. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a load support device for a heavy equipment operator's cab and a method for manufacturing the same, and more particularly, a coupling portion on one side is detachably fixed to a vehicle body frame side, and a separation preventing portion on the other side. Relates to a load support device that is located on the upper side of the bottom frame of the cab and can be fastened from the bottom frame side of the cab to the vehicle body frame side even after the assembly of the cab is completed.

  As shown in FIGS. 1 and 2, the conventional cab support structure includes a load support device 30 that elastically supports the cab 20 with respect to the vehicle body frame 10, and an extension direction of the load support device 30. Thus, only when a predetermined displacement occurs in the cab 20, the vibration absorbing device 40 that regulates the displacement is provided, and the cab 20 is supported in a floating state with respect to the vehicle body frame 10.

  For this purpose, a support frame 12 is provided on the upper part of the body frame 10, and the support frame 12 includes an upper wall 12a and leg portions 12b extending vertically from the front and rear edges of the upper wall 12a. A through hole 14 for mounting the load supporting device 30 and a through hole 16 for mounting the vibration absorbing device 40 are formed in the upper wall 12a of the support frame 12.

  As shown in FIG. 1, an external flange portion 34 is provided in the upper opening portion, and in the load support device 30 attached to the support frame 12, the external flange portion 34 is fitted into the through hole 14 of the upper wall 12 a, and The portion 34 is coupled to the upper surface of the upper wall 12a, and in this state, the outer flange 34 is fastened to the upper wall 12a via a bolt member (not shown).

  Thus, the cab 20 is supported by the vehicle body frame 10 on the four ridges on the back surface of the bottom frame 22 via the load support device 30 to relieve an impact from the vehicle body frame 10 side. However, when the construction machine falls down or collides with rocks, trees, etc., a large impact force acts on the cab 20. For this reason, the cab support structure is provided with the vibration absorbing device 40 capable of providing a function for protecting the cab 20 and the worker from the impact force.

  As shown in FIG. 2, the vibration absorbing device 40 includes a shaft member 42, a stopper 44 through which the shaft member 42 is inserted, and disposed below. The shaft member 42 includes a bolt member including a shaft portion 42 a and a head portion 42 b, and the shaft portion 42 a is fastened to the bottom frame 22 of the cab 20. At this time, the stopper 44 is interposed between the head portions 42 b of the shaft member 42.

  The cab 20 is supported by the four load support devices 30 and a gap (S) is formed between the upper surface of the stopper 44 and the lower surface of the upper wall 12a in a normal state where no vibration or impact is generated from the vehicle body frame 10. And a gap (S1) is formed between the outer peripheral surface of the shaft portion 42a and the inner peripheral surface of the through hole 16 of the upper wall 12a.

  Accordingly, when the cab 20 is displaced away from the vehicle body frame 10, the vibration absorbing device 40 allows the displacement until the upper surface of the stopper 44 can contact the lower surface of the upper wall 12a. When the cab 20 is displaced in a direction approaching the vehicle body frame 10, the vibration absorbing device 40 allows the displacement until the lower surface of the bottom frame 22 of the cab 20 contacts the upper surface of the upper wall 12a. Further, when the cab 20 is displaced in the horizontal direction with respect to the vehicle body frame, the cab 20 is allowed until the outer peripheral surface of the shaft portion 42a comes into contact with the inner peripheral surface of the through hole 16 or the like.

However, the conventional heavy load cab load supporting apparatus and the manufacturing method thereof as described above have the following problems.
A load supporting device 30 is fixed to the front and rear of the above-described body frame 10 mounted on a heavily equipped lower traveling body (not shown) by a fixing means such as a bolt. Then, the bottom frame 22 of the cab 20 is fixed to the load support device 30 by the fixing means. At this time, before the bottom frame 22 is attached to the load support device 30, one side of the vibration absorbing device 40 must be fixed to the bottom surface of the bottom frame 22 by a method such as welding. However, since the support frame 12 normally has a closed structure, it must be very difficult to provide the load support device 40 on the bottom surface of the bottom frame 22.

  Further, since the support frame 12 has a closed structure, the load support device 30 is already fixed to the front and rear of the vehicle body frame 10 by a method such as a bolt, and then the bottom frame 22 of the cab 20 is fixed to the load support device 30. It is necessary to replace or additionally provide the vibration absorbing device 40 after assembly. At this time, there is a problem that the vibration absorbing device 40 cannot be provided without disassembling the cab 20 and the like again.

  On the contrary, the stopper 44 of the vibration absorbing device 40 is provided so as to penetrate the through hole 16 and the other side W is coupled to the lower part of the bottom frame 22 by welding or the like. If the vibration absorbing device 40 is to be disassembled again after it has been completed, the vibration absorbing device 40 must be arbitrarily cut or removed from the bottom frame 22, and the vibration absorbing device 40 cannot be used again. There is also a problem that it was.

  Further, when the vibration absorbing device 40 is attached to the lower surface of the bottom frame 22 by a method such as welding, the fastening portion W due to the welding may be broken by a tensile force or a cutting force during an external impact. Therefore, there is a problem that it is difficult to support the load by the vibration absorbing device 40.

  The present invention has been made in view of the above-described problems, and the object thereof is to enable the load support device to be easily and easily attached and detached even when the vehicle body frame has a closed structure. It is another object of the present invention to provide a load supporting device for a heavy equipment cab and a method for manufacturing the same.

  Another object of the present invention is to provide a load supporting device for a heavy equipment operator's cab that can be easily replaced or additionally provided even after the cab assembly is completed, and a method for manufacturing the same. There is.

  Still another object of the present invention is to provide a load support device for a heavy equipment cab that can be used again after the cab is disassembled, and a method for manufacturing the load support device.

  Still another object of the present invention is to provide a load support device for a heavy equipment operator's cab and a method for manufacturing the load support device in which the fastening portion of the load support device cannot be broken by a tensile force or a cutting force in spite of an external impact. .

  In order to achieve the above object and the like, the present invention provides a vehicle body frame to be mounted on a lower traveling body, a bottom frame at the bottom, a driver's cab mounted on the vehicle body frame, the vehicle body frame, and the bottom frame. A vibration absorbing device that elastically supports the cab with respect to the vehicle body frame, and a load support device that includes a coupling portion on one side and a separation preventing portion on the other side. The load support device coupling portion is detachably fixed to the vehicle body frame side, and the detachment prevention portion passes through the bottom frame and is located on the upper side so that the vehicle body frame and the cab can be assembled. Even after completion, it is possible to fasten from the bottom frame side of the cab to the vehicle body frame side.

  A hollow cylindrical fastening boss is further provided integrally with the bottom of the upper plate of the vehicle body frame, a screw portion is formed in the hollow inside of the fastening boss, and a screw portion is also formed in the coupling portion, It is preferable that the coupling portion and the fastening boss are screw-coupled.

  It is preferable that the detachment preventing portion is composed of a bolt having a head.

  It is preferable that the separation preventing unit further includes a stopper plate of a ring body provided integrally with the load support device.

  A rotation having a coupling surface fixed to one side of the vehicle body frame and an extended surface extending to an upper part of an upper plate of the vehicle body frame, wherein the extended surface is formed with a groove having at least one linear portion. Rotation composed of an anti-rotation plate and a cylindrical anti-rotation boss that is fastened integrally between the coupling portion and the detachment prevention portion of the load support device and includes an anti-rotation portion corresponding to the linear portion on the outer peripheral surface. A prevention device is further provided to prevent the load supporting device from loosening.

  A cylindrical boot that can be vertically expanded and contracted is provided between the bottom frame of the cab and the separation preventing portion, and further includes a sealing device that can maintain airtightness in the cab.

  It is preferable that the outer wall surface of the boot is formed in a bellows shape so as to be vertically stretchable.

  The boot is made of an elastic material, and the upper end is closely fixed to the outer peripheral surface of the detachment preventing portion, and the lower end is closely fixed to the inner peripheral surface of the through hole of the bottom frame of the cab.

  It is preferable to perform a flocking process on the outer peripheral surface of the separation preventing portion and the inner peripheral surface of the through hole of the bottom frame.

  A coupling groove is formed on the outer peripheral surface of the separation preventing portion, and a coupling protrusion is formed on the inner surface of the upper end of the boot. The coupling protrusion is inserted into the coupling groove, and the bottom frame has an annular shape at the bottom. A coupling member provided with a groove is further provided, and a lower end portion of the boot is attached to the annular groove.

  It is preferable that the load supporting device is provided outside the vibration absorbing device.

  More preferably, the load supporting device can selectively apply the quantity and the mounting position according to the load transmission condition of the cab.

  The present invention includes a step of integrally fastening a hollow cylindrical fastening boss provided with a screw thread on the inner side to a bottom surface of an upper frame of a vehicle body frame in which a first through hole is formed by a method such as welding, Fastening a vibration absorbing device that elastically supports the cab to the vehicle, fastening a bottom frame of the cab having a third through hole formed in the upper portion of the vibration absorbing device, and one side Including a step of passing through a load supporting device having a screw portion and a separation preventing portion on the other side in the order of the third through hole and the first through hole, and screwing the screw portion with a screw thread of a fastening boss. Composed.

  The method further includes the step of fastening the bottom plate formed with the second through hole between the step of fastening the vibration absorbing device and the step of fastening the bottom frame of the cab.

  A coupling surface fixed to one side of the vehicle body frame and an extended surface connected to the upper part of the upper plate of the vehicle body frame, and a groove having at least one linear portion is formed on the extended surface; and A cylindrical anti-rotation boss is provided integrally with the load support device between the screw portion and the detachment prevention portion of the load support device, and an anti-rotation portion corresponding to the linear portion is provided on the outer peripheral surface of the anti-rotation boss. The method further includes a stage provided.

  The method further includes the step of providing a sealing device capable of maintaining the airtightness of the inside of the cab by providing a cylindrical boot that can be vertically expanded and contracted between the bottom frame of the cab and the above-described detachment preventing portion.

  According to the load supporting device for heavy equipment cab and the manufacturing method according to the present invention having the above-described configuration, there is an advantage that it can be easily and firmly attached and detached.

As described above, according to the present invention, the following effects are achieved.
(1) By fastening the load support device from the bottom frame side of the cab to the vehicle body frame side, the load support device can be easily mounted even if the vehicle body frame has a closed structure.
(2) By fastening the load support device from the bottom frame side of the cab to the vehicle body frame side, the load support device can be separately provided or replaced even after the cab is assembled.
(3) By fastening the load support device from the bottom frame side of the cab to the vehicle body frame side, the load support device need not be deformed or destroyed even when the cab is disassembled.
(4) By providing a fastening boss on the vehicle body frame and screw-connecting the load support device thereto, the fastening portion of the load support device is not deformed or broken despite an external impact.

  Hereinafter, preferred embodiments of the load supporting device for a heavy equipment cab and the manufacturing method thereof according to the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.

  FIG. 3 is a cross-sectional view illustrating the configuration of the load supporting device and the rotation preventing device for the heavy equipment cab according to the present invention. FIG. 4 illustrates the load supporting device, the rotation preventing device and the heavy equipment cab according to the present invention. The structure of the sealing device is shown as a cross-sectional view, and FIG. 5 is an exploded perspective view showing the structure of the load support device, rotation prevention device, and sealing device of the heavy equipment cab according to the present invention. FIG. 6 is a cross-sectional view taken along the line A-A ′ of FIG. 3.

  As shown in FIG. 3, the load supporting device of the heavy equipment cab of the present invention is mounted on a vehicle body frame 100 that is turnably mounted on a lower traveling body (not shown), and mounted on the vehicle body frame 100. A bottom plate 110, a driver's cab 122 having a bottom frame 120 coupled to the top of the bottom plate 110, a vibration absorber 130 provided between the vehicle body frame 100 and the bottom plate 110, and equipment are overturned. The load support device 140 prevents the driver's cab from being detached or floating in such an emergency.

  The vibration absorbing device 130 is for reducing the impact that can be indirectly transmitted to the driver's cab 122 during normal times such as running or working, thereby improving riding comfort. The vibration absorbing device 130 is fixed to the vehicle body frame 100 by bolts and other body frame fixing means 132, and the vibration absorbing device 130 is again connected to the bottom frame 120 and the bottom plate 110 by bolts and other bottom frame fixing means 134. Tightened to.

  Accordingly, the vibration absorbing device 130 functions to fix the bottom frame 120 and the like to the vehicle body frame 100 and also functions to buffer the impact of the vehicle body frame 100. In the present invention, it is preferable to provide the vibration absorbing device 130 inside the load supporting device 140 in order to prevent the vibration absorbing device 130 from losing its buffer function beyond the elastic limit at the time of collision with the outside.

  The load support device 140 according to the present invention is integrally formed with the vehicle body frame 100, and includes a fastening boss 142 having an internal thread on the inside, a screw portion 144 screwed to the fastening boss 142, and a radial extension. From the head 146 whose outer peripheral edge has a polygonal shape, a bolt 148 comprising a body portion 147 that connects the screw portion 144 and the head portion 146, and a stopper plate 150 provided at the lower end of the head portion 146 of the bolt Become.

  The vehicle body frame 100 includes an upper plate frame 100a in which a mounting hole 104 for mounting the above-described vibration absorbing device 130 and a first through hole 106 through which the screw portion 144 of the bolt 148 passes are formed. The upper plate frame 100a includes a side plate frame 100b for supporting the upper plate frame 100a on the vehicle body. The upper plate frame 100a and the side plate frame 100b generally have a closed structure. Accordingly, the fastening boss 142 of the present invention is fixed to one side of the bottom surface of the upper plate frame 100a by a method such as welding before the upper plate frame 100a and the lower plate frame 100b are combined with the vehicle body. And provided.

  Meanwhile, the bottom plate 110 and the bottom frame 120 are formed with a second through hole 112 and a third through hole 124 at positions corresponding to the first through hole 106 so that the screw portion 144 of the bolt 148 can pass therethrough. To do.

  The stopper plate 150 has an annular shape, and the inner diameter of the stopper plate is the same as or larger than the diameter of the screw portion 144, and the outer diameter is larger than that of the second through hole 112 and the third through hole 122. It is formed in a large size and is integrally connected to the bolt 148 by a method such as welding or assembly.

  A configuration in which the head 146 of the bolt 148 and the stopper plate 150 integrally provided in the lower portion of the head of the bolt 148, or the head 146 of the bolt 148 and the stopper plate 150 are integrally coupled is referred to as a separation preventing portion.

  The load support device 140 of the present invention includes a coupling surface 164 having a fixing hole 162 on one side, and a “U” -shaped groove extending from the coupling surface 164 and having at least a straight portion 166 on one side or both sides. And an anti-rotation plate 170 having an overall "L" shape, and the anti-rotation plate 170 so that the anti-rotation plate 170 can be coupled to the vehicle body plate 100. The anti-rotation boss 180 is provided with an anti-rotation fixing means 172 fitted in the hole 162 and an anti-rotation portion 174 corresponding to the linear portion 166 so that the bolt 148 does not rotate, and is coupled to the outside of the body portion 147. Is further provided with an anti-rotation device 190 that includes and is configured.

  The anti-rotation boss 180 is provided at a predetermined position in the longitudinal direction of the screw portion 144, but is fixed integrally by a method such as welding. The gap (d) between the lower surface of the stopper plate 150 and the upper surface of the bottom frame 120 is determined according to the installation position of the rotation prevention boss 180. That is, as shown in FIG. 5, the load support limit of the load support device 140 is determined by the distance from the lower end of the rotation prevention boss 180 to the lower surface of the stopper plate 150.

  The load support device 140 according to the present invention includes a cylindrical boot 200 that can be vertically expanded and contracted and whose outer wall surface has a bellows shape, and a coupling member 210 for fixing the boot 200 to the bottom frame 120. Are further included.

  In normal times, the load transmitted from the vehicle body frame 100 to the cab 122 is mitigated by the vibration absorber 130, so that the load support device 140 does not perform this function. The load support device 140 performs this function only in the case of an emergency that can be separated by a distance.

  In other words, the load support device 140 collides with an external object during operation or work, and an external force is applied to the driver's cab 122 or a protective structure that protects the driver's cab, or the vehicle body is overturned. When a direct impact is applied to the vehicle 122, the coupling relationship between the cab 122 and the vehicle body frame 100 is made firm, and the cab 122 is prevented from being detached from the vehicle frame 100 or deformed. In particular, the cab 122 is prevented from rotating left and right or floating upward.

  Accordingly, the vehicle body frame 100 and the cab 122 are not normally subjected to any interference in relation to the load support device 140. Therefore, the separation preventing portion of the load support device 140 and the bottom frame 120 of the cab 122 are not affected. A predetermined interval (d) between them or a predetermined interval (d ′) between the load support device 140 and the third through hole 124 is always formed.

  Various noises, dust, and the like flow into the cab 122 from the vehicle body frame 100 through the gaps (d, d ') and act as factors that hinder the safe driving of the driver. Therefore, the sealing device 220 is provided so that the load supporting device 140 is fixed to the vehicle body frame 100 side as described above, and the stopper plate 150 having a detachment preventing jaw or the like can be penetrated to the bottom frame 120 side of the cab 122. At the same time, it has a function of blocking noise and dust that may be generated.

  The upper end of the boot 200 is fastened to the outer peripheral surface of the stopper plate 150 by various methods. For example, the outer peripheral surface of the stopper plate 150 can be adhered with an adhesive, or the elasticity of the boot 200 can be used to maintain airtightness. At this time, the outer peripheral surface of the stopper plate 150 and the inner peripheral surface of the boot can be flocked so that the airtightness can be more reliably maintained. However, in the embodiment of the present invention, the coupling groove 152 is formed on the outer peripheral surface of the stopper plate 150, the coupling projection 202 is provided on the inner circumferential surface of the boot 200, and the coupling projection 202 is inserted into the coupling groove 152. ing.

  The coupling member 210 is formed of a ring body having an annular groove 212 on the bottom surface, and the coupling member 210 is fixed to the bottom frame 120 by a coupling member fixing means 214 such as a bolt. Accordingly, the lower end portion of the boot 200 is incorporated into the annular groove 212 and fixed.

Hereinafter, a method of manufacturing a load supporting device for a heavy equipment cab of the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.
According to the present invention, first, the upper plate frame 100a and the lower plate frame 100b of the vehicle body frame 100 are assembled, or the fastening boss 142 is welded to the bottom surface of the upper plate frame 100a before the vehicle body frame 100 is mounted on the vehicle body. It is manufactured integrally by the method.

  Then, the bottom plate 110 is seated on the upper part of the vibration absorbing device 130 fastened to the body frame 100 by the body frame fixing means 132. Separately, after the coupling member 210 is fastened to the bottom frame 120 of the cab 122 using the coupling member fixing means 214, the boot 200 is provided in the annular groove 212. After the bottom frame 120 of the cab 122 provided with the boot 200 is seated on the top of the bottom plate 110, the bottom frame fixing means 134 is fastened.

  Next, the load support device 140 is assembled. At this time, the bolt 148 and the stopper plate 150, and the bolt 148 and the rotation prevention boss 180 are integrally manufactured by a method such as welding.

  The assembled load support device 140 is fastened to the fastening boss 142 via the second through hole 112 and the third through hole 124. The male screw thread of the screw part 144 of the bolt 148 and the female screw thread of the fastening boss 142 are screw-coupled and fastened firmly. The coupling protrusion 202 of the boot 200 is inserted into the coupling groove 152 of the stopper plate 150, and the boot 200 is fastened to the stopper plate 150.

  Finally, an anti-rotation device 190 is provided. The bolt 148 is adjusted so that the straight portion 166 of the rotation prevention plate 170 matches the rotation prevention portion 174 of the rotation prevention boss 180, and then the rotation prevention plate 170 is fastened to the vehicle body frame 100 by the rotation prevention fixing means 172.

  As described above, the present invention provides a lower surface of the vehicle body frame so that it can be easily and easily attached and detached without disassembling the cab even when the vehicle body frame has a closed structure. It can be seen that the technical idea is that a load supporting device that includes a fastening boss in advance and is screwed to the fastening boss is fastened from the bottom frame side to the bottom plate side of the cab. Various modifications can be made by those having ordinary skill in the art within the scope of the basic technical idea of the present invention as described above.

It is sectional drawing showing the structure of the load support apparatus of the heavy equipment cab by a prior art. It is sectional drawing showing the principal part structure of the load support apparatus of the heavy equipment cab by a prior art. It is sectional drawing showing the structure of the load support apparatus and rotation prevention apparatus of the heavy equipment cab by this invention. It is sectional drawing showing the structure of the load support apparatus, rotation prevention apparatus, and sealing apparatus of the heavy equipment cab by this invention. It is a disassembled perspective view showing the structure of the load support apparatus, rotation prevention apparatus, and sealing apparatus of the heavy equipment cab by this invention. It is sectional drawing of A-A 'of FIG.

Explanation of symbols

100 Body frame 110 Bottom plate 120 Bottom frame 122 Driver's cab 130 Vibration absorber 140 Load support device 142 Fastening boss 144 Screw portion 146 Head portion 147 Body portion
148 Bolt 150 Stopper plate 200 Boot 220 Sealing device

Claims (16)

A body frame mounted on the lower traveling body,
A bottom frame is provided at the bottom, and a cab mounted on the vehicle body frame;
A vibration absorber provided between the body frame and the bottom frame to elastically support the cab with respect to the body frame, a coupling portion on one side, and a separation preventing portion on the other side Comprising a load support device comprising:
After the assembly of the vehicle body frame and the driver's cab is completed, the connecting portion of the load supporting device is detachably fixed to the vehicle body frame side, the separation preventing portion penetrates the bottom frame and is located on the upper side. The load supporting device for a heavy equipment cab, which can be fastened from the bottom frame side of the cab to the vehicle body frame side.   A hollow cylindrical fastening boss is further provided integrally with the bottom of the upper plate of the vehicle body frame, a screw part is formed inside the hollow of the fastening boss, and a screw part is also formed in the coupling part, The load supporting device for a heavy equipment cab according to claim 1, wherein the coupling portion and the fastening boss are screw-coupled.   The load supporting device for a heavy equipment cab according to claim 1, wherein the separation preventing part is a bolt having a head.   The load supporting device for a heavy equipment cab according to claim 3, wherein the separation preventing unit further includes a stopper plate of a ring body provided integrally with the load supporting device.   A coupling surface fixed to one side of the vehicle body frame and an extended surface extending to the upper part of the upper plate of the vehicle body frame, and a groove having at least one linear portion is formed on the extended surface. Rotation comprising an anti-rotation plate, and a cylindrical anti-rotation boss that is fastened integrally between the coupling portion and the detachment prevention portion of the load support device and includes an anti-rotation portion corresponding to the linear portion on the outer peripheral surface. 4. The load supporting device for a heavy equipment cab according to claim 1, further comprising a preventing device to prevent the load supporting device from loosening.   The apparatus further comprises a sealing device that is provided with a cylindrical boot that can be vertically expanded and contracted between a bottom frame of the cab and the detachment preventing portion to maintain airtightness in the cab. 3. A heavy load cab load support device according to 3.   The load support device for a heavy equipment cab according to claim 6, wherein the boot is formed in a bellows shape that can be vertically expanded and contracted on the outer wall surface.   The boot is made of an elastic material, and the upper end of the boot is closely fixed to the outer peripheral surface of the detachment preventing portion, and the lower end of the boot is closely fixed to the inner peripheral surface of the through hole of the bottom frame of the cab. The load supporting device for a heavy equipment cab according to claim 6.   The load supporting device for a heavy equipment operator cab according to claim 8, wherein the outer peripheral surface of the separation preventing portion and the inner peripheral surface of the through hole of the bottom frame are flocked.   A coupling groove is provided on the outer peripheral surface of the separation preventing portion, and a coupling protrusion is formed on the inner surface of the upper end of the boot. The coupling protrusion is inserted into the coupling groove and fastened, and the bottom frame is attached to the bottom frame. The heavy load cab load support device according to claim 6, further comprising a coupling member provided with an annular groove at a bottom portion, and a lower end portion of the boot being fastened to the annular groove.   The load support device for a heavy equipment cab according to claim 1, wherein the load support device is provided outside the vibration absorbing device.   The load supporting device for a heavy equipment cab according to claim 1, wherein the load supporting device can selectively apply a quantity and a mounting position according to a load transmission condition of the cab.   A step of integrally fastening a hollow cylindrical fastening boss provided with a screw thread on an inner plate bottom surface of a body frame formed with a first through hole by welding or the like; A step of fastening a vibration absorbing device that elastically supports the cab, a step of fastening a bottom frame of the cab having a third through hole on an upper portion of the vibration absorbing device, and a screw portion on one side And passing through a load supporting device having a separation preventing part on the other side in the order of the third through hole and the first through hole, and screwing the screw part to the screw thread of the fastening boss. A method for manufacturing a load supporting device for a heavy equipment cab characterized by comprising:   14. The method according to claim 13, further comprising the step of fastening a bottom plate formed with the second through hole between the step of fastening the vibration absorbing device and the step of fastening the bottom frame of the cab. A load supporting device manufacturing method for heavy equipment cab as described in 1.   A coupling surface fixed to one side of the vehicle body frame and an extended surface extending to an upper part of the upper plate of the vehicle body frame, and a groove having at least one linear portion is formed on the extended surface. In addition, a cylindrical anti-rotation boss is provided integrally with the load support device between the screw portion and the detachment prevention portion of the load support device, and an anti-rotation corresponding to the linear portion on the outer peripheral surface of the anti-rotation boss. The method for manufacturing a load supporting device for a heavy equipment cab according to claim 13 or 14, further comprising a step of providing a section.   The method further includes a step of providing a sealing device capable of maintaining the airtightness of the inside of the cab by providing a cylindrical boot that can be vertically expanded and contracted between the bottom frame of the cab and the above-described detachment preventing portion. The method for manufacturing a load supporting device for a heavy equipment cab according to claim 13 or 14, characterized in that:

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